Prior height, growth, and wood anatomy differently predispose to drought-induced dieback in two Mediterranean oak speciesk

Camarero, J. Julio; Sangüesa‐Barreda, Gabriel; Vergarechea, Marta

doi:10.1007/s13595-015-0523-4

Cited by 65 publications

(48 citation statements)

References 51 publications

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“…By contrast, trees with damaged crowns have a reduced capacity for photosynthesis (Brasier, 1996). Many stressors have been related with crown dieback including site factors and tree-to-tree competition (Heitzman et al, 2007;Camarero et al, 2016;Colangelo et al, 2017a). In our study, elevation showed a significant relationship with crown dieback (Fig.…”

Section: Site Factors Modulating Persian Oak Decline and Mortalitymentioning

confidence: 46%

“…At a regional scale, tree mortality may be mainly influenced by climate, for instance extreme events, such as drought and high temperatures (Anderegg et al, 2012). Tree mortality can occur across a wide range of spatial and temporal scales, from the gradual death of individual trees (Ogaya & Peñuelas, 2007;Camarero et al, 2016) to the abrupt mortality of thousands of trees over large areas due to severe disturbance events (Allen et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…As regards the need to improve our understanding of forest response to the current climate change, it might be of great importance to investigate site and stand structure effects, buffering or enhancing decline process of forests decline (Heitzman et al, 2007;Camarero et al, 2016;Colangelo et al, 2017a). As regards the specific case of oak trees, water deficit is the most common stressing factor related to physiological weakness (Jenkins & Pallardy, 1995;Lloret et al, 2004;Ogaya & Peñuelas, 2007;Fan et al, 2008;Haavik et al, 2015), triggering episodic tree declines and mortality (Fan et al, 2012;Keyser & Brown, 2016;Sánchez-Salguero et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Site factors and stand conditions associated with Persian oak decline in Zagros mountain forests

Hosseini

Linares

2018

Forest Syst

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Aim of study: Drought and stand structure are major and interconnected drivers of forest dynamics. Water shortage and tree-to-tree competition may interact under the current climate change scenario, increasing tree mortality. In this study, we aimed to investigate climate trends, site and stand structure effects on tree mortality, with the main hypothesis that drought-induced mortality is higher as competition increases.Area of study: Persian oak forests from Zagros Range, western Iran. Material and methods:We split the study area into 20 topographical units (TUs), based on aspect, slope and elevation. In each TU, three 0.1 ha plots were established to quantify site and stand characteristics, namely the diameter of all trees and shrubs, stand density and basal area, canopy dieback and mortality. In addition, soil profiles were analyzed to obtain physical and chemical soil properties. Six transects 100 m length were established per TU to measure tree-to-tree competition for alive and dead trees.Main results: The highest mortality rates and crown dieback were found at higher elevations and southern and western aspects. Our findings confirm increasing rates of tree mortality in stands with higher tree density and shallow soils. As regard links between climate change and forest decline, our results suggest that changing forest structure may have a significant impact on dust emission.Research highlights: Despite severe dry years occurred recently the study area, they are not significantly different than those recorded in the past. Stand structure appears as a modulating factor of climate change effects, linked to competition-related tree vulnerability to drought.

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Section: Site Factors Modulating Persian Oak Decline and Mortalitymentioning

confidence: 46%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Site factors and stand conditions associated with Persian oak decline in Zagros mountain forests

Hosseini

Linares

2018

Forest Syst

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“…This differs with other deciduous species of the Mediterranean which show positive signals towards winter precipitation (e.g. for Quercus species: Camarero et al, 2016;Cherubini et al, 2003;Corcuera et al, 2004;Di Filippo et al, 2010). Quercus species are known to have roots that reach deep into the ground and may attain profound water reserves (Cherubini et al, 2003) and thus make use of deeply infiltrated winter precipitation.…”

Section: Prior Winter To Early Spring Conditionsmentioning

confidence: 84%

“…However, several authors studying deciduous ring-porous Quercus species growing in a Mediterranean environment have shown the importance of precipitation in late spring and early summer on tree-ring width formation (e.g. Camarero et al, 2016;Di Filippo et al, 2010;Tessier et al, 1994). The water balance at that period is of major importance for the growth of deciduous ring-porous Quercus species because most of the latewood is formed at that time (Di Filippo et al, 2010).…”

Section: Precipitation Of Late Spring To Early Summermentioning

confidence: 99%

Imprisoned in the Cretan mountains: How relict Zelkova abelicea (Ulmaceae) trees cope with Mediterranean climate

Fazan

Guillet

Corona

et al. 2017

Science of The Total Environment

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• We established the first ever centennial chronology for a broadleaved tree on Crete.• Zelkova abelicea is most sensitive to precipitation and drought in May-June.• No growth change can be related to the increase in dry conditions of the past decades.• Z. abelicea has a high capacity to withstand changing environmental conditions.We investigate the sensitivity of the relict, endemic Cretan tree species Zelkova abelicea (Lam.) Boiss. (Ulmaceae) to several climate variables (temperature, precipitation and drought). For this purpose, we establish the first centennial tree-ring chronology for the species, and the first ever tree-ring chronology for a broadleaved species on Crete. We demonstrate the strong sensitivity of Z. abelicea towards precipitation and drought in late spring to early summer and the absence of a significant response to abundant precipitation occurring during winter or early spring. Whereas the late spring sensitivity is strong and consistent through time, the species seems to be experiencing a loss of signal towards early summer conditions since the 1970s, interpreted as an earlier cessation of cambial activity due to the increase in summer drought conditions on Crete. However, despite a reduced vegetative period, no significant decrease in radial growth of Z. abelicea was observed in the tree-ring series for the last decades, thus highlighting the capacity of Z. abelicea to withstand changing environmental conditions.

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Black Truffle Harvesting in Spanish Forests: Trends, Current Policies and Practices, and Implications on its Sustainability

García-Barreda

Forcadell²,

Sánchez

et al. 2017

Environmental Management

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The European black truffle is a mycorrhizal fungus native to Spanish Mediterranean forests. In most Spanish regions it was originally commercially harvested in the second half of the 20th century. Experts agree that wild truffle yields suffered a sharp decline during the 1970s and 1980s. However, official statistics for Spanish harvest are scarce and seemingly conflicting, and little attention has been paid to the regime for the exploitation of truffle-producing forests and its implications on the sustainability of this resource. Trends in harvest from 1969 to 2013 and current harvesting practices were analyzed as a case study, taking into account that Spain is a major truffle producer worldwide, but at the same time truffles have only recently been exploited. The available statistical sources, which include an increasing proportion of cultivated truffles since the mid-1990s, were explored, with estimates from Truffle Harvesters Federation showing higher consistency. Statistical sources were then compared with proxies for wild harvest (rents from truffle leases in public forests) to corroborate time trends in wild harvesting. Results suggest that black truffle production is recovering in recent years thanks to plantations, whereas wild harvest is still declining. The implications of Spanish legal and institutional framework on sustainability of wild truffle use are reviewed. In the current scenario, the decline of wild harvest is likely to continue and eventually make commercial harvesting economically unattractive, thus aggravating sustainability issues. Strengthening of property rights, rationalization of harvesting pressure, forest planning and involvement of public stakeholders are proposed as corrective measures.

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Prior height, growth, and wood anatomy differently predispose to drought-induced dieback in two Mediterranean oak speciesk

Cited by 65 publications

References 51 publications

Site factors and stand conditions associated with Persian oak decline in Zagros mountain forests

Site factors and stand conditions associated with Persian oak decline in Zagros mountain forests

Imprisoned in the Cretan mountains: How relict Zelkova abelicea (Ulmaceae) trees cope with Mediterranean climate

Black Truffle Harvesting in Spanish Forests: Trends, Current Policies and Practices, and Implications on its Sustainability

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